In a single-line Input form, when users click the "Enter" key, workflows associated with the input get triggered/submitted by default. While this is not a native feature of the Multiline Input form, there is a workaround if you'd like to have the "Enter" key submit the form.

In the "Only when" condition above, we ensure that whenever the input's value is changed and that value contains arbitrary text (which equals a new line - see screenshot below), we can run the actions we want to run when the form is submitted:

Keep in mind that we only evaluate the Multiline Input's value and therefore trigger this event when the user removes focus from the input (i.e. clicks away from the element).